Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 13 of 13

Thread: SWG and shock confusion

  1. Back To Top    #1
    MelissaDean's Avatar
    Join Date
    Jun 2015
    Location
    salemburg NC
    Posts
    13

    SWG and shock confusion

    Good morning all.

    Trying to clear up cloudy water.

    Currently my CYA is at 35.

    The chart only shows shock level for high CYA readings for the salt water system ... why is that? Do I have to have my CYA that high and do I really have to shock my pool differently because of salt water?

    Started to become very frustrated with this honestly.

    Any advice is appreciated.


    10'000 Gallon with Salt Water System

  2. Back To Top    #2

    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Location
    Sebring, Florida
    Posts
    30,077

    Re: SWG and shock confusion

    With a CYA of 35, you should bring your FC up to around 16 ppm and then hold it there.....not to shock but to SLAM.

    Have you read the SLAM article?

    Why are you frustrated?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  3. Back To Top    #3
    MelissaDean's Avatar
    Join Date
    Jun 2015
    Location
    salemburg NC
    Posts
    13

    Re: SWG and shock confusion

    Ok so it's ok to go by the non SWG chart then.
    Yes I'm familiar with the slam process ... been reading, studying and learning every bit of this that I can.
    But was just unsure about the chart ... for the slam (so use to saying shock) levels.

    Been dealing with all this for about a month. Started with green swampy water .... then yellow mustard algae that was the worst to get rid of ... all because I was switching over to salt water system and I didn't have enough chlorine in it while salt was dissolving and a few mishaps on my part were included as well.



    10'000 Gallon with Salt Water System

  4. Back To Top    #4
    Mod Squad pooldv's Avatar
    Join Date
    Aug 2012
    Location
    DFW, TX
    Posts
    23,994

    Re: SWG and shock confusion

    Sounds like you are all set now. One more SLAM to clear the algae and then maintain your chlorine level from there. Be sure to brush all the little nooks and crannies to expose all algae to the chlorine.

    I personally am no fan of algae and avoid it like the plague by keeping my chlorine levels a couple ppm above target at all times, 8-9 for 70 CYA saltwater. One SLAM is enough for me!
    TFP Moderator
    If TFP helped you or saved you money - Become a TFP Supporter! <--Click here
    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

  5. Back To Top    #5
    MelissaDean's Avatar
    Join Date
    Jun 2015
    Location
    salemburg NC
    Posts
    13

    Re: SWG and shock confusion

    Quote Originally Posted by duraleigh View Post
    With a CYA of 35, you should bring your FC up to around 16 ppm and then hold it there.....not to shock but to SLAM.

    Have you read the SLAM article?

    Why are you frustrated?
    BTW duraleigh ... thank you!

    10'000 Gallon with Salt Water System

  6. Back To Top    #6
    MelissaDean's Avatar
    Join Date
    Jun 2015
    Location
    salemburg NC
    Posts
    13

    Re: SWG and shock confusion

    Quote Originally Posted by pooldv View Post
    Sounds like you are all set now. One more SLAM to clear the algae and then maintain your chlorine level from there. Be sure to brush all the little nooks and crannies to expose all algae to the chlorine.

    I personally am no fan of algae and avoid it like the plague by keeping my chlorine levels a couple ppm above target at all times, 8-9 for 70 CYA saltwater. One SLAM is enough for me!
    Thank you so much pooldv. Definitely a good reminder to brush the pool ... something we haven't probably been very diligent about. Read your message and then sent the hubby out to brush it really good.
    How do you keep your FC level so high?

    10'000 Gallon with Salt Water System

  7. Back To Top    #7

    Join Date
    Mar 2015
    Location
    Cantonment, FL (Pensacola Area)
    Posts
    380

    Re: SWG and shock confusion

    You won't want to do do it until after you complete the SLAM, but once done you can bring your CYA up and lose less FC to sunlight. You SWG can then keep up better and/or run less and extend its life. That's just the "rough" details though, others can help you with the math and specifics when you're done with the SLAM.

    My CYA is TOO high still at 130, but that combined with being in a screen enclosure I only lose 1 ppm FC a day if there is no bather load. My SWG is at only 20% for 5 hours a day and my FC steadily climbs unless the pool is being used. With that CYA I'd be miserable if I had to SLAM it though. Years of pucks were used before I moved in but having only the SWG now it's slowly falling. It started at 180
    Scott
    15,000 Gallons vinyl in-ground screen enclosed, Hayward Eco-star SP3400VSP, Hayward Aqua Logic PL-Plus, Hayward T-15 Salt Cell, Hayward S244T Sand Filter, Polaris 380 with booster pump, Hayward heat pump HP50HA. K-2006 kit.

  8. Back To Top    #8

    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Location
    Sebring, Florida
    Posts
    30,077

    Re: SWG and shock confusion

    Melissa,

    Good advice above. Complete the SLAM and then add enough CYA to get to a total of 60-70 for your SWG.

    You'll be close to perfect for the rest of the summer.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  9. Back To Top    #9
    Mod Squad YippeeSkippy's Avatar
    Join Date
    Jan 2012
    Location
    'burbs of Augusta, Georgia
    Posts
    6,467

    Re: SWG and shock confusion

    Quote Originally Posted by MelissaDean View Post
    Go

    Currently my CYA is at 35.

    The chart only shows shock level for high CYA readings for the salt water system ... why is that? Do I have to have my CYA that high and do I really have to shock my pool differently because of salt water?
    For NON-SWG pools, the recommendation is to keep the CYA level lower, like 30-50 depending on sun exposure and such.
    But SWG pools work in a different way with a more constant low level chlorine production, so the TFP recommendation is to run the CYA at a higher level, 70-80ish as a specific way to maintain the SWG chlorine.

    Sooooooo....the CYA/Chlorine chart is in two parts- NON-SWG and SWG. But at NO time do you want to let your CYA get out of control and too high, as the only way to lower the CYA is to do water replacements. Ugh!

    I hope this helps explain things?
    My Amazon Smile for November12K Fiberglass IG, Infinity 4000 automatic cover, SWCG, Hayward Sand Filter, Hayward 1.5 Pump, Doheny Discovery Robot, Savi Melody LED pool lights, outdoor speakers and other assorted doo-dads. Sundance Altamar Hot Tub.
    Our pool build--> Our Pool Solved Our Sloping Yard Skippy's Cheap Pool Cooler -->Skippy's New Fountain

  10. Back To Top    #10
    MelissaDean's Avatar
    Join Date
    Jun 2015
    Location
    salemburg NC
    Posts
    13

    Re: SWG and shock confusion

    Quote Originally Posted by YippeeSkippy View Post
    For NON-SWG pools, the recommendation is to keep the CYA level lower, like 30-50 depending on sun exposure and such.
    But SWG pools work in a different way with a more constant low level chlorine production, so the TFP recommendation is to run the CYA at a higher level, 70-80ish as a specific way to maintain the SWG chlorine.

    Sooooooo....the CYA/Chlorine chart is in two parts- NON-SWG and SWG. But at NO time do you want to let your CYA get out of control and too high, as the only way to lower the CYA is to do water replacements. Ugh!

    I hope this helps explain things?
    Thank you ... I understand better now.
    Starting to feel a bit more hopeful now.

    10'000 Gallon with Salt Water System

  11. Back To Top    #11
    MelissaDean's Avatar
    Join Date
    Jun 2015
    Location
    salemburg NC
    Posts
    13

    Re: SWG and shock confusion

    Quote Originally Posted by duraleigh View Post
    Melissa,

    Good advice above. Complete the SLAM and then add enough CYA to get to a total of 60-70 for your SWG.

    You'll be close to perfect for the rest of the summer.
    Gotcha ... thanks!

    10'000 Gallon with Salt Water System

  12. Back To Top    #12
    Richard320's Avatar
    Join Date
    Jan 2010
    Location
    San Dimas, CA (LA County)
    Posts
    18,768

    Re: SWG and shock confusion

    Quote Originally Posted by MelissaDean View Post
    Good morning all.

    Trying to clear up cloudy water.

    Currently my CYA is at 35.

    The chart only shows shock level for high CYA readings for the salt water system ... why is that? Do I have to have my CYA that high and do I really have to shock my pool differently because of salt water?

    Started to become very frustrated with this honestly.

    Any advice is appreciated.


    10'000 Gallon with Salt Water System
    During the SLAM, your pool IS a bleach pool. You're chlorinating with bleach. So use that chart for shock level.

    When you get the water sparkling, then you can raise CYA if you wish. You'll lose less FC to the sun and the SWG won't have to work as hard which will extend its life.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

  13. Back To Top    #13
    Mod Squad pooldv's Avatar
    Join Date
    Aug 2012
    Location
    DFW, TX
    Posts
    23,994

    Re: SWG and shock confusion

    Quote Originally Posted by MelissaDean View Post
    Thank you so much pooldv. Definitely a good reminder to brush the pool ... something we haven't probably been very diligent about. Read your message and then sent the hubby out to brush it really good.
    How do you keep your FC level so high?

    10'000 Gallon with Salt Water System
    Once you finish the SLAM it will be easier to maintain your FC. Raising your CYA will help reduce loss to the sun. And having NO algae in your pool using chlorine will help.

    I run the SWG a little more to keep it up. And I add bleach sometimes to help also. Especially on big swim weekends, big pollen times, etc. Anytime I notice my FC drop a point or two I will bump it with bleach.
    TFP Moderator
    If TFP helped you or saved you money - Become a TFP Supporter! <--Click here
    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •